The invention discloses a
rare earth ion doped Na3MF7 (M=Zr, Hf) nanocrystalline with a simple
spectrum band up-conversion
luminescence characteristic and a preparation method thereof, and belongs to the field of inorganic luminescent materials. The preparation method comprises the following step of: based on
zirconium oxychloride or
hafnium oxychloride and
rare earth ion salt as raw materials, performing
solvothermal reaction at 90-130 DEG C in a mixed
solvent of
ethanol,
oleic acid and
oleylamine for 1-24 hours to obtain monodisperse Yb / Er or Yb / Tm co-doped Na3MF7 (M=Zr or Hf) nano cubic blocks in uniform dimension and shape. Under
radiation of 980 nanometer
laser, Yb / Er co-doped nanocrystalline can emit bright
red light and Yb / Tm co-doped nanocrystalline can emit strong near-
infrared light. The material is expected to be widely applied to the field of
solar battery and biomarker.